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I heard that transistors have two main purposes, amplifying signals and switching on and off very quickly. I also heard that relays can acts as switches. Relays rely on a magnetic force pulling the switch of another circuit on and off. What are the advantages and disadvantages of relays and transistors, and in which cases should wae use both?

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The main difference is that relays switch a different circuit while transistors switch the circuit that the transistor is in.

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